United announced they had reached an agreement with Juventus for the 36-year-old forward to return to Old Trafford on Friday.
The Premier League club will pay €15m (£12.9m) plus a further €8m (£6.9m) in add-ons for the Portugal captain, who completed a medical in Lisbon over the weekend.
“Everyone who knows me, knows about my never ending love for Manchester United,” Ronaldo said on Instagram.
“I’m right here! I’m back where I belong! Let’s make it happen once again!”
Ronaldo scored 118 goals in 292 games for United between 2003 and 2009, winning three Premier League titles, the Champions League, the FA Cup and two League Cups.
(Sky Sport)
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